Method of Inhibiting Polymerization Giving Copolymer of Divinylbenzene and Aromatic Vinyl Compound

Abstract

[PROBLEMS] To provide: a method by which the generation of a copolymer of an aromatic vinyl compound and either the divinylbenzene generated in the production of the aromatic vinyl compound or the divinylbenzene which has come into the system together with a raw material for the aromatic vinyl compound is inhibited in the steps of distilling, purifying, and storing the aromatic vinyl compound: and a method of inhibiting the copolymer from depositing on and thus fouling devices and facilities.[MEANS FOR SOLVING PROBLEMS] The method of inhibiting the generation of a copolymer of divinylbenzene and an aromatic vinyl compound is characterized in that a dinitrophenol compound (A), a sulfonic acid compound (B), and a p-phenylenediamine compound (C) are simultaneously used in the steps of producing, purifying and storing the aromatic vinyl compound.

Description

TECHNICAL FIELD[0001]The present invention relates to a polymerization inhibiting method of inhibiting the formation of a copolymer of an aromatic vinyl compound and divinylbenzene which has been generated in the production of the aromatic vinyl compound, in the steps of producing and purifying the aromatic vinyl compound.BACKGROUND ART[0002]Styrene and derivatives thereof as aromatic vinyl compounds are industrially very important chemical compounds as raw materials for polystyrene, synthetic rubber, ABS resin, etc., and have been mass-produced industrially.[0003]Generally, aromatic vinyl compounds have been obtained by carrying out dehydrogenation of corresponding alkylbenzene in the presence of catalysts. For example, in the case of styrene, ethylbenzene has been brought into contact with inorganic catalysts to obtain styrene, and obtained styrene has been separated from ethylbenzene with distillation, and purified. At this time, a small amount of divinylbenzene is also generated...

AI Technical Summary

Benefits of technology

[0015]In accordance with the method of the present invention, there are exhibited such economical effects that in the steps of producing, purifying and storing an aromatic vinyl compound, formation of a cross-linked copolymer of the aromatic vinyl compound and divinylbenzene which has been generated or come into the system in the steps of producing and purifying the aromatic vinyl compound is inhibited, the generation and the depositing of fouling in devices and facilities, which are caused by the copolymer, are inhibited, the reduction and the improvement of conventional works of removing the copolymer are effected, the maintenance of the process flow and the thermal conduction along with continuous operations over a long period of time become possible, and the improvement of the safe operations, products yield, and products quality can be effected.

Problems solved by technology

Therefore, copolymers in which divinylbenzene and styrene are cross-linked to each other have been formed during the production of styrene, and deposited in interiors of devices as fouling to cause a serious problem in the operations of devices and facilities for use in the production of styrene.

However, in these polymerization inhibiting methods, a large amount of polymerization inhibitor has been used, but satisfactory effects on the polymerization inhibition against copolymers in which divinylbenzene and aromatic vinyl compounds are cross-linked to each other cannot be exhibited, and accordingly, the improvement thereof has been strongly desired.

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